Brake shoe



Ap 25, 1933- w. B. SUTHERLAND 1,905,575

BRAKE SHOE Filed May 9,' 1931 Z77 z/ nfo 7: I I 2% 5% Patented Apr. 25, 1933 UNITED STATES PATENT oFFIcr:

WALLACE B. SUTHEBLAND, OI BUI'IEBN, NEW YORK, ABSIGNOR TO THE AMERICAN BRAKE SHOE AND FOUNDRY COMPANY, 01' WIL TION OF DELAWARE G'I'ON, DELAWARE, A C'OBPOBA- BRAKE SHOE Application filed lay a, 1931. serial no. 586,147;

This invention relates to brake shoes and more particularly to those cast iron'shoes which are provided with reenforce backs and which may or may not be provided with inserts in the wearing face.

One of the objects of the invention is to rigidly unite the cast iron body and the reenforce back.

Another object of the invention is'to provide a reenforce back having portions thereof bent downwardly in a novel manner into the cast iron body and forming a locking engagement therewith to prevent parts of the bod falling away from the shoe in the event 0 its fracture.

I have shown the invention in a car shoe having a ductile metal back commonly called a steel back and with a solid cast iron body, and referring thereto Fig. 1 is a side elevation showing the back in full lines and the bent down portions of the back in broken lines.

Fig. 2 is a top plan view of Fig. 1.

Fig. 3 is a sectional view on the line 3-3 of Fig. 1.

Fig. 4 is a sectional view on the line 44 of Fig. 1.

Fig. 5 is a sectional view showing a modified form of the invention.

Referring to the drawing, 6 is the body of the shoe, 7 is the ductile metalback, and 8 is the attaching lug. The back is in channel form having its marginal side edge portions bent downwardly to form flanges 9 which enclose the ad'acent corners of the body. At each side 0 the longitudinal center of the back it is provided with a plurality of downwardly inclined and transversely extending tongues or sections 10, Figs. 1-4, which are embedded in the body. These tongues or sections are formed by cutting the'back and bending the tongues or sections downward, and enlarged openings 11 are formed in the back at the tongues to receive the body metal in the casting operation. In Figs. 1-4 the tongues project downwardly. and outwardly from the longitudinal middle portion of the back towards the flanges 9and in Fig. 5 the tongues 12 project downwardly and inwardly from the flanlges 9 towards the longitudinal middle of t e shoe. The cast iron fills the openings 11 and makes interlocking engagement with the tongues to securely unite the body and back. In Figs. 1-4 the body metal is buttoned, in effect, between the tongues and the flanges, and in Fig. 5 the body metal is buttoned, in eifect, between opposing to ues and between the tongues and the inner e ges of the openings. The ends of the back have projections 13 with dovetail recesses 14 therebetween. These projections are bent upwardly and are completely embedded in the end lugs 15. The cast iron fills the dovetail recesses and makes interlockin engagement between the projections an lu to securely unite the ends of the back an the body at the end lugs thereon. The back is also provided with elongated openings 16 at or about itsmiddle and adjacent each side thereof to receive the body metal which flows through said openings to form the reianforcing projections 17 of the attaching The invention provides a simple and eflicient means for securely uniting the body and back of a brake shoe so that in event of the body fracturing in use the parts thereof will be retained on the back to continue to give braking service and will be prevented from falling causing damage and injury.

I do not restrict the invention to the particular embodiment illustrated in the draw-- ing but propose to employ it in any shoe for which it is or may be adapted and I reserve the right to make all changes in theaway and possibly V not reenforce back and a body cast thereon, side edge flanges on the back enclos'mgthe ad acent corners of the body, and downwar y and transversely extending ton es stamped from the back, said back having openings formed by stamping said tongues and sald openings being enlarged opposite the tongues to permit the body metal to flow freely into the openings during the casting operation for securing the body to the back.

3. A brake shoe comprising a one-piece reenforce back and a body cast thereon, side edge flanges on the back enclosing the adiacent corners of the body, and downwar ly and inwardly extending tongues stamped from the back at the top of said flanges, said back having openings formed by stamping said tongues and said openings being enlarged transversely of the back to permit the body metal to flow freely into the openings during the casting operation for securing the body to the back.

4. A brake shoe comprising a one-piece reenforce back and a body cast thereon, side edge flanges on the back enclosing the ad'acent corners of the body, and downwardly and transversely'extending tongues stamped from the back, said back having openings formed by stamping said tongues and said openings being enlarged opposite the tongues to permit the body metal to flow freely into the openings during the casting operation for securing the body to the back; an attaching lug, and said back having elongated openings between the side flanges to permit the body metal to flow therethrough during the casting operation and form reenforcements for the attaching lug.

WALLACE B. SUTHERLAND. 

